Genotype x environment interaction studies in promising early genotypes of rice
Twenty one early rice genotypes including four local check varieties (Gurjari, GR-3, GR-7 and GR-12) were evaluated for their stability parameters with respect to eighteen quantitative and qualitative traits in 3 environments (Nawagam, Dabhoi and Dahod) during kharif season of 2012. The genotypes x environments interaction and its G x E (linear) component were significant for all the characters except grain length, grain breadth, grain L:B ratio, test weight, kernel length, kernel breadth, kernel L:B ratio, kernel length after cooking, alkali spreading value and amylose content. The non-linear component of G x E interaction was also significant for all the characters except straw yield per plant, grain length, grain breadth, test weight, kernel breadth, kernel L : B ratio, hulling %, kernel length after cooking, alkali spreading value and amylose content when tested against pooled error suggested importance of both linear and non-linear components in building up total G x E interaction. Among twenty one genotypes, only one genotype NWGR-9147 was found stable with wide adaptability for grain yield per plant along with the stability for days to 50% flowering, plant height, straw yield per plant and milling percentage characters hence the cultivar could be used for cultivation over a range of environments.
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